按照IEEE 802.1Q标准，VLAN标识字段在以太网帧的什么位置

以下哪个组播地址是DR和BDR使用的地址

以太网中的DROther路由器能和哪些路由器形成邻接关系？

You are the administrator of the large OSPF network and are considering dividing it to multiple areas. What are two advantages of configuring multiple OSPF areas?

In OSPF, a Designated Router (DR) floods LSAs to all the routers on the segment that it has a neighbor relationships with. Over what kind of link does this happen and what kind of LSA type is sent?

哪种类型的OSPF网络需要手工指定OSPF邻居?

一台路由的FE口启用了OSFP，缺省情况下， 这个100Mbps的以太网接口的OSPF cost值是多少？

帧中继和ATM网络缺省的OSPF网络类型是什么？

OSPF中不能直接计算出路由的LSA是?

One of the WAN links on an OSPF has just gone down, causing a network topology change. What does an OSPF network do to maintain route consistency when it notices a change in the network?

OSPF中LSAck报文说法不正确的是：